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Influence of whisker volume fraction on the creep behavior of alumina composites reinforced with silicon carbide

Published online by Cambridge University Press:  03 March 2011

Kenong Xia  and
Terence G. Langdon
Kenong Xia
Affiliation:
Department of Mechanical and Manufacturing Engineering, University of Melbourne, Parkville, Victoria, Australia 3052
Terence G. Langdon
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles. California 90089-1453
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Abstract

Four-point bending creep tests were conducted in air on two alumina matrix composites reinforced with 18 and 30 vol% of silicon carbide whiskers, respectively. In both materials, the SiC whiskers tended to form agglomerates. In the temperature range from 1673 to 1823 K, the stress exponents, n, were ∼3.9 and ∼6.3 and the activation energies for creep, Q, were ∼690-740 and ∼930-1010 kJ mol−1 for the composites containing 18 and 30 vol % of SiC, respectively. It is shown that the higher value of n in the composite with 30 vol % of SiC whiskers may be lowered to ∼3 by incorporating a threshold stress. The creep strength of both composites was enhanced by comparison with a similar composite containing 9.3 vol % of SiC whiskers, but there was only a very minor improvement in creep strength when the volume fraction of whiskers was increased from 18 to 30 vol %.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 11 , November 1995 , pp. 2925 - 2932
Copyright
Copyright © Materials Research Society 1995

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